[vtkusers] getting a blank volume when trying to perform an x-ray projection in Java

[David Gobbi]

Hi Mark,

For projections, I added a new filter called vtkImageProjection to
vtk-devel that will create a projection image from a 3D image.  It
isn't picky about data types, it will take whatever is given.  But it
has two caveats:
1) it is a filter, not a mapper, so you have to use vtkImageActor to
   display the result on-screen
2) It only does x, y, and z projections so it must be preceded by
   vtkImageReslice if other perspectives are needed

I don't know if it will be useful to you, but just in case.

  David